关键词: 汽车空气动力学, 数值模拟, 队列行驶, 气动阻力

Abstract: Based on auto—control，the MIRA simplified model was used as the object of Intelligent Vehicle System research， and the flow field around single car and three—car platoon were numerically simulated respectively，while the ground efect Was simulated by the moving wall boundary condition．The pressure distributions in symmetry section are shown．Comparing with the distribution of a single car，the situations are similar，but the positive pressure area of the two back cars’front part is evidendy weakened．There are two types of positions，the salne space and different space．Th e analysis of aerodynamics resistances shows that the two back cars’resistances are smaller than the leading car'S resistance and the average resistance fals a litde contrasting with the single car's resistance．The numerical simulations of flow field around three—car platon were carried out by changing the distance of cars．The rule of aerodynamics resistances of three cars platon influenced by space is found．It establishes the base for the latter research．

Key words: vehicle aerodynamics, numerical simulation, driving platon, aerodynamic resistance